The Collaborative International Dictionary
Adjusting surface
Adjusting plane \Adjusting plane\, Adjusting surface \Adjusting surface\ (A["e]ronautics) A small plane or surface, usually capable of adjustment but not of manipulation, for preserving lateral balance in an a["e]roplane or flying machine.
Usage examples of "adjusting surface".
He lay back, obscurely resentful that his chair's self-adjusting surface kept him from scrunching down to sulk properly, and felt six years old again, arguing over who got to be the sheriff and who had to be the horse thief.